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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a299d49740c426ff90151e88414a67005e325fc746892183ae6f0e3d2c025bc' 
  AND token = '3UnnU7onk1iko3ajM+fFgF904lVTDYh+lUigBYcFVCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}